The world's longest known cave system.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

Its columns were all carved from the same white oak tree.

The only example of a Paris Métro sign in use at a subway station outside of the French capital. 

This exuberantly curated landscape is one of the largest sculpture gardens in Canada.

Small ship votives hang from the vaulted ceiling of this port-side church with a Latin inscription on the wall.

A historic Montreal market that was the city's agricultural hub for over century.

The biggest museum dedicated to insects in North America, one of the largest in the world.

The skyline of Montreal includes the silhouette of an unexpected fruit-shaped Canadian staple.

A Montreal deli that was so beloved that it was allowed to circumvent their laws of language.

One of Canada's oldest museums, the beautiful Redpath has been serving up Natural History and Ethnography since 1882.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

A bizarre house filled with an astounding array of collections.

This holy goods emporium is where priests go for a little retail therapy to outfit their churches.

Literally a million fascinating cartographic artifacts are held in this sprawling university collection.

A unique botanical garden housed in three giant geodesic domes.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

An off-the-beaten-path place to literally hang beneath Milwaukee's Holton Street Bridge.

A group of artists transformed this desolate city alleyway into an outdoor gallery of street art.

A wonderfully curated used bookstore in an airport.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

An eatery within the Minneapolis American Indian Center writes colonial ingredients out of the story of Native American cuisine.